<template>
    <el-menu default-active="1-4-1" 
        class="el-menu-vertical-demo" 
        @open="handleOpen" 
        @close="handleClose"
        :collapse="isCollapse"
        background-color="#545c64"
        text-color="#fff"
        active-text-color="#ffd04b">
        <h3>{{isCollapse ? 'Json' : 'Json管理界面'}}</h3>
        <el-menu-item @click="clickMenu(item)" v-for="item in noChildren" :key="item.name" :index="item.name">
            <i :class="`el-icon-${item.icon}`"></i>
            <span slot="title">{{item.label}}</span>
        </el-menu-item>
        <el-submenu v-for="item in hasChildren" :key="item.label" :index="item.label">
            <template slot="title">
                <i :class="`el-icon-${item.icon}`"></i>
                <span slot="title">{{item.label}}</span>
            </template>
            <el-menu-item-group v-for="subItem in item.children" :key="subItem.path">
                <el-menu-item @click="clickMenu(subItem)" :index="subItem.path">{{subItem.label}}</el-menu-item>
            </el-menu-item-group>
        </el-submenu>
    </el-menu>
</template>

<style scoped lang="less">
  .el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 400px;
  }

  .el-menu{
    height: 116vh;
    border-right: none;
    h3{
        color: #fff;
        text-align: center;
        line-height: 48px;
        font-size: 16px;
        font-weight: 400;
    }
  }
</style>

<script>
import Cookie from 'js-cookie'
export default {
  data() {
    return {
    };
  },
  methods: {
    handleOpen(key, keyPath) {
      console.log(key, keyPath);
    },
    handleClose(key, keyPath) {
      console.log(key, keyPath);
    },
    clickMenu(item){
      console.log(item)
      // 当页面的路由与跳转的路由不一致才允许跳转
      if(this.$route.path !== item.path && !(this.$route.path === '/home' && (item.path === '/'))){
        this.$router.push(item.path)
      }

      // 面包屑
      this.$store.commit('selectMenu',item)
    }
  },
  computed: {
      // 没有子菜单
      noChildren(){
          return this.menuData.filter(item => !item.children)
      },
      // 有子菜单
      hasChildren(){
          return this.menuData.filter(item => item.children)
      },
      menuData(){
          // 判断当前数据，如果缓存中没有，从store中获取
          return JSON.parse(Cookie.get('menu')) || this.$store.state.tab.menu
      },
      isCollapse(){
        return this.$store.state.tab.isCollapse
      }
  }
}
</script>